<template>
  <li>
    <label>
      <input type="checkbox"
             :checked="todo.done"
             @change="handleCheck(todo.id)" />
      <span v-show="!todo.isEdit">{{ todo.title }}</span>
      <input class="ipt"
             type="text"
             v-show="todo.isEdit"
             @blur="handleBlur(todo, $event)"
             ref="inputTitle">
    </label>
    <button class="btn btn-danger"
            @click="handleDelete(todo.id)">删除</button>
    <button class="btn btn-edit"
            @click="handleEdit(todo)"
            v-show="!todo.isEdit">编辑</button>
  </li>
</template>

<script>
export default {
  name: 'MyItem',
  //声明接收todo对象
  props: ['todo'],
  methods: {
    //勾选or取消勾选
    handleCheck (id) {
      //通知App组件将对应的todo对象值取反
      // this.checkTodo(id);
      this.$bus.$emit('checkTodo', id);
    },
    //删除
    handleDelete (id) {
      //通知App组件将对应的todo删除
      // this.deleteTodo(id);
      this.$bus.$emit('deleteTodo', id);
    },
    //编辑
    handleEdit (todo) {
      if (todo.hasOwnProerty) {
        todo.isEdit = true;
      } else {
        this.$set(todo, 'isEdit', true);
      }
      this.$nextTick(function () {
        this.$refs.inputTitle.focus();
      })
    },
    //input框失去焦点
    handleBlur (todo, e) {
      todo.isEdit = false;
      if (!e.target.value) return alert('输入不能为空');
      this.$bus.$emit('updateTodo', todo.id, e.target.value);
    }
  },
};
</script>

<style scoped>
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}

li:hover button {
  display: block;
}

.ipt {
  outline: none;
  border: none;
}
</style>
